64556404090 has 12 divisors (see below), whose sum is σ = 116202973626. Its totient is φ = 25822240248.

The previous prime is 64556404067. The next prime is 64556404091. The reversal of 64556404090 is 9040465546.

It can be written as a sum of positive squares in only one way, i.e., 58100763681 + 6455640409 = 241041^2 + 80347^2 .

It is not an unprimeable number, because it can be changed into a prime (64556404091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 763297 + ... + 843643.

Almost surely, 2^64556404090 is an apocalyptic number.

64556404090 is a deficient number, since it is larger than the sum of its proper divisors (51646569536).

64556404090 is an frugal number, since it uses more digits than its factorization.

64556404090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160701 (or 80354 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 64556404090 in words is "sixty-four billion, five hundred fifty-six million, four hundred four thousand, ninety".